
import unittest
import user_code
import ast
import re   
import importlib
import csv
import unittest
import importlib
import io
import sys
import pandas as pd
from contextlib import redirect_stdout

class TestTask(unittest.TestCase):
    def setUp(self):
        self.data = {
            'amount': [5000, 15000, 9000, 20000, 7000],
            'country': ['USA', 'USA', 'Iran', 'France', 'North Korea']
        }
        self.df = pd.DataFrame(self.data)
        self.high_risk = ['Iran', 'North Korea']

    def test_column_added(self):
        import user_code
        importlib.reload(user_code)
        df_copy = self.df.copy()
        result = user_code.flag_compliance(df_copy, self.high_risk)
        _dynamic_test(
            self,
            'compliance_flag' in result.columns,
            "compliance_flag column is added to DataFrame",
            "compliance_flag column was not added to DataFrame"
        )

    def test_amount_flag(self):
        import user_code
        importlib.reload(user_code)
        df_copy = self.df.copy()
        result = user_code.flag_compliance(df_copy, self.high_risk)
        # Index 1 and 3 have amounts > 10000
        _dynamic_test(
            self,
            result.loc[1, 'compliance_flag'] == True and result.loc[3, 'compliance_flag'] == True,
            "Transactions with amount > 10000 are flagged",
            "Transactions with amount > 10000 are not correctly flagged"
        )

    def test_high_risk_country_flag(self):
        import user_code
        importlib.reload(user_code)
        df_copy = self.df.copy()
        result = user_code.flag_compliance(df_copy, self.high_risk)
        # Index 2 (Iran) and 4 (North Korea) should be flagged
        _dynamic_test(
            self,
            result.loc[2, 'compliance_flag'] == True and result.loc[4, 'compliance_flag'] == True,
            "Transactions from high-risk countries are flagged",
            "Transactions from high-risk countries are not correctly flagged"
        )

    def test_non_flagged_transaction(self):
        import user_code
        importlib.reload(user_code)
        df_copy = self.df.copy()
        result = user_code.flag_compliance(df_copy, self.high_risk)
        # Index 0: amount=5000, country=USA, not flagged
        _dynamic_test(
            self,
            result.loc[0, 'compliance_flag'] == False,
            "Non-flagged transactions remain unflagged",
            "Non-flagged transactions are incorrectly flagged"
        )

    def test_summary_output(self):
        import user_code
        importlib.reload(user_code)
        df_copy = self.df.copy()
        f = io.StringIO()
        with redirect_stdout(f):
            user_code.flag_compliance(df_copy, self.high_risk)
        output = normalize_text(f.getvalue())
        expected = normalize_text("Flagged 4 out of 5 transactions for compliance review.")
        _dynamic_test(
            self,
            expected in output,
            "Summary statement prints correct flagged and total count",
            f"Expected output: '{expected}' not found in: {output}"
        )

def _dynamic_test(test_case, condition, success_message, failure_message):
    if condition:
        test_case._testMethodName = success_message
        test_case.assertTrue(True, success_message)
    else:
        test_case._testMethodName = failure_message
        test_case.fail(failure_message)

def normalize_text(text):
    text = text.lower()
    text = re.sub(r"\\s{2,}", " ", text)
    text = re.sub(r"\\s*([,:?])\\s*", r"\\1 ", text)
    return text.strip()

def change_var(code: str, var_name: str, value: str) -> str:
    tree = ast.parse(code)
    lines = code.splitlines()
    changed = False
    # Collect all assignment nodes to modify
    assign_nodes = [
        (i, node)
        for i, node in enumerate(tree.body)
        if isinstance(node, ast.Assign)
        and any(isinstance(target, ast.Name) and target.id == var_name for target in node.targets)
    ]

    # If nothing to change, return unmodified code
    if not assign_nodes:
        return code

    # Perform replacements for all matching assignments (from last to first to not break line offsets)
    for i, node in reversed(assign_nodes):
        start_line = node.lineno - 1
        line = lines[start_line]
        indent = ' ' * (len(line) - len(line.lstrip()))
        lines[start_line] = f"{indent}{var_name} = {value}"
        next_line = len(lines)
        for next_node in tree.body[i+1:]:
            if hasattr(next_node, 'lineno'):
                next_line = next_node.lineno - 1
                break
        if next_line > start_line + 1:
            lines[start_line+1:next_line] = []
        changed = True

    return '\\n'.join(lines) if changed else code

if __name__ == "__main__":
    unittest.main()


test_main.py

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Challenge: Implement Compliance Flags

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